[MCPE-20767] Observer sends out two redstone pulses when a piston head retracts in front of it Created: 01/Apr/17  Updated: 02/Aug/17  Resolved: 31/Jul/17

Status: Resolved
Project: Minecraft (Bedrock codebase)
Component/s: None
Affects Version/s: 1.1.0.0, 1.1.0.9, 1.0.9.1
Fix Version/s: 1.2.0.2

Type: Bug
Reporter: Michael Jerome P Reyes
Resolution: Fixed Votes: 5
Labels: observer, redstone

Attachments: File Observers triggering twice.mcworld    
Issue Links:
Duplicate
is duplicated by MCPE-22046 Observer sends out two redstone pulse... Resolved
Relates
relates to MCPE-24130 Observers Emit a Double Pulse When De... Resolved
Confirmation Status: Confirmed
Platform: Android
CHK:
ADO: 70574

 Description   

Observer block causes a 2 pulse tick after receiving a block update from a retracting piston.

Also the my device is Sony E5353



 Comments   
Comment by [Mojang] Mega_Spud (Jay Wells) [ 31/Jul/17 ]

Fixed for 1.2.0.2 (referring to pistons only, not pushing a block)

Comment by Bruno [ 23/Jul/17 ]

Win 10 - 1.1.4
any piston, sticky or normal, moving the piston head in front of the observer:
extending -> observer fires once
retraction -> observer fires twice

sticky piston with block moving in front of the observer
extending -> observer fires twice
retraction -> observer fires once

Comment by PHO [ 23/May/17 ]

Confirmed on 1.0.9 / iOS and attached a very trivial test world.

Also note that when it observes a block pushed by a piston, it also emits pulses twice.

Comment by Michael Gill [ 06/Apr/17 ]

It seems to work correctly with a sticky piston and block. If the observer detects an empty piston is redstone dust, when in a chain especially, the result is a pulsing output. With sticky pistons and blocks the chain can be world height and you still just get one pulse output.

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